00blacka4

iTrader: (7)

iv read and i think im gonna run the cheapo ngk tr55 but i was wondering what i should gap them at.... .50 or .55 ? iv heard both and iv heard .60 so can someone help me out please.....thanks

LS6427

iTrader: (2)

Do not use .060, even if the LS1 came that way from the factory, its NOT proper. I think GM even came out with a notice to use a smaller gap. I've tried gaps from .035 - .060, with my stock engine, and with my 427ci....

Gap them to .050, thats the best gap you can have on a N/A LS1, from stock up to 650 RWHP.

Also, NGK are probably the best plugs you can use....TR55 or TR5, same identical plugs, Use whiche3ver ones you can find. The TR55's are becoming hard to find. But it doesn't matter, they are 100% identical.

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Jon@Texas-Speed

iTrader: (18)

We have the TR55 plugs on the shelf. Gap them about .050" and you should be good to go!

Jon

00blacka4

iTrader: (7)

thanks guys thats what i wanted to know.....im supsoed to use the cheapo tr55s right ? not the irridium ones that are like 10 a pop lol ?

LS6427

iTrader: (2)

NGK are not cheapos, they are perhaps the best plug you can buy. I tried those super-duper iridiums once....had 100%, absolutely, zero performance change, and as far as gas mileage.....absolutely nothing at all noticeable, nothing.

Those things are a complete waste of money.

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01ssreda4

iTrader: (96)

Yes they are cheapos, like $1.79 apiece. Thats pocket change compared to some of the other BS plugs they market.

LS6427

iTrader: (2)

Price is meaningless......they are probably the best plug made for our engines....thats all that matters. If they were $4.00 each I would still use them.

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mbrownin

iTrader: (1)

If you got them for performance or mileage changes beyond what any new plug might give you, then you got suckered. Their advantage is not wearing out nearly as fast (as in lasting 4 times longer) as regular copper plugs. Not a big deal if you actually like changing plugs. I don't want to do it any more often than I have to, so it's iridium for me.

LS6427

iTrader: (2)

12 years ago when I bought the car I just thought that I would try them (iridiums) at my first plug change around 40,000 miles. They are useless and had zero change in any way, shape or form. So yeah, I was suckered into buying complete crap......I'm just not that stupid anymore. Thats why I don't have a K&N air filter and I don't use synthetic oils, octane booster, ring sealers and oil additives.

And I'm not one of those people that believe any plug should go more than 40,000 miles. They start decreasing in performance the day you put them in and start driving. 30,000-40,000 miles later they are tired. I like to have fresh plugs in there every 30,000-40,000 miles, regardless of which brand, model or type it is.

Its too cheap not to have peak performance MOST of the time you drive the car.

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buddha845

iTrader: (3)

just curious, do you have some extra knowledge on the construction/materials used or is this based on your trial and error through the years of f body ownership?

i went with NGK TR5 iridiums but im pretty brand loyal so i dont have any experience with other plugs

LS6427

iTrader: (2)

No extra knowledge, just what almost everyone uses and says are the best they've used....over the past 12 years I've owned my LSx.

I've tried the iridiums once and I had to buy Bosch plugs once because I couldn't find NGK anywhere in town once and I already pulled the plugs out so I needed something. The Bosch were complete crap, at least in my engine, big noticeable difference. My engine also will not even run with Bosch 02 sensors, so maybe my engine just hates Bosch stuff. I pulled the Bosch out the next day and put in AC Delco plugs, seemed normal. But about a month later I found some TR55's and put them in.

So its just 12 years of experience with them and hundreds of other people who use them who post about plugs.

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sjsingle1

iTrader: (1)

champion IRs .060.......runs like a ...........champion !!!!!